MAX11800ETC/V+T Maxim Integrated Products, MAX11800ETC/V+T Datasheet - Page 27

• Manufacturer Part Number: MAX11800ETC/V+T
• Description: IC TOUCH SCREEN CTRLR LP 12WQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX11800ETC/V+T

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1 TSC
• Resolution (bits): 12 b
• Data Interface: Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 105k
• Voltage - Supply: 1.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 12-WQFN Exposed Pad
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 105k
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 10. Edge Interrupt Mode (Direct Conversion Mode)—MAX11800–MAX11803
Panel setup commands configure the touch panel prior to
a measurement. Panel setup commands allow the panel
to fully settle before performing a measurement. The
panel setup command summary is shown in Table 8. See
the register map in the Status and Configuration Registers
section for details on the panel setup timing options for X,
Y, Z1, and Z2 measurements.
The continuation bit (CONT) of the panel setup com-
mand programs the MAX11800–MAX11803 to maintain
the present panel setting at the end of the command
(CONT = 1). Panel setup commands assume a logical
progression to an appropriate measurement. For exam-
ple, when the MAX11800–MAX11803 are in the X panel
setup mode, the devices can proceed to an X measure-
ment mode only. The devices return to LPM when an
incompatible command follows a panel setup com-
mand. See Figure 11. For most applications adequate
time for panel setup is available as an integral part of
Table 8. Panel Setup Command Summary
Low-Power, Ultra-Small Resistive Touch-Screen
0x6Bh
0x6Dh
0x69h
0x6Fh
HEX
READBACK OPERATIONS ARE NOT SHOWN, BUT ARE EXECUTED DURING TDM PERIODS.
TIRQ DURATION (t
SCAN INTERVAL (t
SCAN DURATION (t
TIRQ
PANEL
TOUCH
IRQ
AP
SD
______________________________________________________________________________________
) IS CONTROLLED BY THE AP AND THE INITIATION OF DM SCAN EVENTS.
) IS SPECIFIED BY THE GENERAL CONFIGURATION REGISTER (0x01).
) IS A FUNCTION OF THE SCAN TYPE AND CONFIGURATION SETTINGS.
TDM
ACCESS
Write
Write
Write
Write
BEGINNING OF TOUCH EVENT
t
IRQ
Panel Setup Commands
DCM SCAN
Controllers with I
ETAG = 00
PAIRABLE
LPM
t
AP
No
No
No
No
INITIATED AND CONTROLLED BY
DCM SCAN
ETAG = 01
the panel measurement commands; configured using
the panel setup timing configuration register, 0x05. The
dedicated panel setup commands are primarily provid-
ed to support applications where the AP needs to con-
trol panel setup directly or long panel setup time is
required.
A measurement command selects one of the four phys-
ical setup options: X, Y, Z1, or Z2.
All panel measurement commands include timed inter-
vals to power up both the internal ADC and the panel
with programmable durations. The delayed conversion
time (t
(0x06)) governs the time that the panel and the ADC
need to settle prior to the initiations of conversions. The
minimum delayed conversion time is 10μs, which is the
time the internal ADC needs to power up. If more set-
tling time is required, increase the panel settling time
THE AP
t
SD
D_CV
COMMAND LENGTH
DCM = DIRECT CONVERSION MODE
, delayed conversion configuration register
LPM
END OF TOUCH EVENT
2
8
8
8
8
C/SPI Interface
Panel Measurement Commands
DCM SCAN
ETAG = 10
X = panel setup
Y = panel setup
Z1 = panel setup
Z2 = panel setup
OPERATION
TDM
27